One plus sign of urinary occult blood indicates the presence of red blood cells in the urine. Normally, greater than 5 red blood cells per high magnification field of view after centrifugation is 1 plus. The presence of red blood cells in the urine is not recommended to be taken lightly, especially in adults, and should be considered first for the possibility of malignancy. For urine occult blood 1 plus, observe whether there are symptoms such as urinary frequency and urgency, if there is urinary frequency and urgency, consider the possibility of urinary tract infection. If there is pain in the lower back, consider whether there are urinary stones. If there is acidic urine, consider the possibility of urinary tuberculosis. If you have urinary occult blood 1 plus, it is recommended to do ultrasound of kidney, ureter and bladder to effectively exclude tumor and stone, and it is recommended to drink more water.